Plexopathy „turning into“ contralateral multiplex polyneuropathy in a patient with chronic CSF inflammation and monoclonal gammopathy

Introduction: Immunologically mediated PNP displays a variety of heterogeneous and dynamic patterns that are often diagnostically challenging. Case: A 70-year-old well-adjusted diabetic patient presented with lower back pain and painful weakness of hip flexion and adduction on the left. EMG/ENG showed acute signs of denervation in the M. rectus femoris and M.adductor magnus as well as in the paravertebral muscels of nerve roots L2, L3 and L5 on the left. MRI showed inflammatory signal abnormalities of the left lumbosacral plexus. A compressive / infiltrative tumour or paraneoplastic disorder was was not found. T…